Lightweight, Insulating Geopolymer Earthbags Part 2

Some desirable properties of lightweight, insulating geopolymer were discussed in Part 1. I was very happy to find this sample of geopolymer from TogTech in the Czech Republic. It’s exactly what I was describing in Part 1. This material could be poured, used to make bricks, hollow core blocks, or even used in earthbags so forms aren’t required. In summary, you’d have all the advantages of stone (fire resistance, almost indefinite durability, etc.) and it would be lightweight and insulating.

Just one possibility:
– use narrower earthbags to save on materials (18″ bags are standard, but would require way more geopolymer)
– earthbags can be used to create virtually any shape building (best suited to curved and round shapes)
– almost no tamping required — just enough to settle the contents
– form a keyway in top of earthbags as they’re stacked to increase stability
– rebar could be added horizontally and vertically for added strength
– tamp walls flat to reduce plastering
– plaster would readily bond to the porous surface… no mesh required (this would require removing the bags which is not normally recommended, although it’s acceptable in this case since geopolymer would be stronger than tamped earth)